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I have an RCA HD Rear Projection Screen TV, I have replaced the bulb (actually my second one ) and now it makes a high pitched humming/whining sound from the back of the tv, the TV only stays on for a few hours and than when the humming/whining continues it causes the color to go bad than the noise stops than starts back up later on , even after I turn the power off, the noise stays continuous for some time , I am very frustrated. Could this be the fan or something else and is it safe while the humming is going on. Signed very irritated.

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